[2a7d6c3e] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[2a7d6c3e] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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[295ca00] | 7 | <!-- <!ENTITY stunnel-download-http "https://www.stunnel.org/downloads/stunnel-&stunnel-version;.tar.gz"> -->
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| 8 | <!ENTITY stunnel-download-http " ">
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| 9 | <!ENTITY stunnel-download-ftp "ftp://ftp.stunnel.org/archive/5.x/stunnel-&stunnel-version;.tar.gz">
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| 10 | <!ENTITY stunnel-md5sum "bf4c13ea9705156abd04f1d766093ea">
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| 11 | <!ENTITY stunnel-size "624 KB">
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| 12 | <!ENTITY stunnel-buildsize "7.9 MB">
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[372898b] | 13 | <!ENTITY stunnel-time "0.1 SBU">
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[2a7d6c3e] | 14 | ]>
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| 15 |
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[436c2f7e] | 16 | <sect1 id="stunnel" xreflabel="stunnel-&stunnel-version;">
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[d3469f0] | 17 | <?dbhtml filename="stunnel.html"?>
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| 18 |
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| 19 | <sect1info>
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| 20 | <othername>$LastChangedBy$</othername>
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| 21 | <date>$Date$</date>
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| 22 | </sect1info>
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| 23 |
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[436c2f7e] | 24 | <title>stunnel-&stunnel-version;</title>
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[d3469f0] | 25 |
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| 26 | <indexterm zone="stunnel">
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[436c2f7e] | 27 | <primary sortas="a-stunnel">stunnel</primary>
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[d3469f0] | 28 | </indexterm>
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| 29 |
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| 30 | <sect2 role="package">
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[436c2f7e] | 31 | <title>Introduction to stunnel</title>
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[d3469f0] | 32 |
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[436c2f7e] | 33 | <para>The <application>stunnel</application> package contains a program
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[d3469f0] | 34 | that allows you to encrypt arbitrary TCP connections inside SSL (Secure
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| 35 | Sockets Layer) so you can easily communicate with clients over secure
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[436c2f7e] | 36 | channels. <application>stunnel</application> can be used to add SSL
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[d3469f0] | 37 | functionality to commonly used <application>Inetd</application> daemons
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[ac38e9dc] | 38 | such as POP-2, POP-3, and IMAP servers, along with standalone daemons such
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| 39 | as NNTP, SMTP, and HTTP. <application>stunnel</application> can also be
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| 40 | used to tunnel PPP over network sockets without changes to the server
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| 41 | package source code.</para>
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[d3469f0] | 42 |
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[ac38e9dc] | 43 | &lfs77_checked;
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[ee792ef] | 44 |
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[d3469f0] | 45 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 46 | <itemizedlist spacing="compact">
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| 47 | <listitem>
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| 48 | <para>Download (HTTP): <ulink url="&stunnel-download-http;"/></para>
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| 49 | </listitem>
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| 50 | <listitem>
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| 51 | <para>Download (FTP): <ulink url="&stunnel-download-ftp;"/></para>
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| 52 | </listitem>
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| 53 | <listitem>
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| 54 | <para>Download MD5 sum: &stunnel-md5sum;</para>
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| 55 | </listitem>
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| 56 | <listitem>
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| 57 | <para>Download size: &stunnel-size;</para>
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| 58 | </listitem>
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| 59 | <listitem>
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| 60 | <para>Estimated disk space required: &stunnel-buildsize;</para>
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| 61 | </listitem>
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| 62 | <listitem>
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| 63 | <para>Estimated build time: &stunnel-time;</para>
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| 64 | </listitem>
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| 65 | </itemizedlist>
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| 66 |
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[436c2f7e] | 67 | <bridgehead renderas="sect3">stunnel Dependencies</bridgehead>
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[d3469f0] | 68 |
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| 69 | <bridgehead renderas="sect4">Required</bridgehead>
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[372898b] | 70 | <para role="required">
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| 71 | <xref linkend="openssl"/>
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| 72 | </para>
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| 73 |
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| 74 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 75 | <para role="optional">
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[ac38e9dc] | 76 | <ulink url="ftp://ftp.porcupine.org/pub/security/">tcpwrappers</ulink> and
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| 77 | <ulink url="https://dist.torproject.org/">TOR</ulink>
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[372898b] | 78 | </para>
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[d3469f0] | 79 |
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[3597eb6] | 80 | <para condition="html" role="usernotes">User Notes:
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| 81 | <ulink url="&blfs-wiki;/stunnel"/></para>
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| 82 |
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[d3469f0] | 83 | </sect2>
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| 84 |
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| 85 | <sect2 role="installation">
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[436c2f7e] | 86 | <title>Installation of stunnel</title>
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[d3469f0] | 87 |
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| 88 | <para>The <command>stunnel</command> daemon will be run in a
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| 89 | <command>chroot</command> jail by an unprivileged user. Create the
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[1ae11c9] | 90 | new user and group using the following commands as the
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[50d61ed] | 91 | <systemitem class="username">root</systemitem> user:</para>
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[d3469f0] | 92 |
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[b785ab29] | 93 | <screen role="root"><userinput>groupadd -g 51 stunnel &&
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[436c2f7e] | 94 | useradd -c "stunnel Daemon" -d /var/lib/stunnel \
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[1ae11c9] | 95 | -g stunnel -s /bin/false -u 51 stunnel</userinput></screen>
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[d3469f0] | 96 |
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| 97 | <note>
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[372898b] | 98 | <para>A signed SSL Certificate and a Private Key is necessary to run the
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[ac38e9dc] | 99 | <command>stunnel</command> daemon. After the package is installed, there
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| 100 | are instructions to generate them. However, if you own or have already
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| 101 | created a signed SSL Certificate you wish to use, copy it to
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[50d61ed] | 102 | <filename>/etc/stunnel/stunnel.pem</filename> before starting the build
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[8ba08b56] | 103 | (ensure only <systemitem class="username">root</systemitem> has read and
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[372898b] | 104 | write access). The <filename class="extension">.pem</filename> file must
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| 105 | be formatted as shown below:</para>
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[d3469f0] | 106 |
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[30ca77d2] | 107 | <screen><literal>-----BEGIN PRIVATE KEY-----
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| 108 | <replaceable><many encrypted lines of private key></replaceable>
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| 109 | -----END PRIVATE KEY-----
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[2a7d6c3e] | 110 | -----BEGIN CERTIFICATE-----
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[3597eb6] | 111 | <replaceable><many encrypted lines of certificate></replaceable>
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[30ca77d2] | 112 | -----END CERTIFICATE-----
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| 113 | -----BEGIN DH PARAMETERS-----
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| 114 | <replaceable><encrypted lines of dh parms></replaceable>
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| 115 | -----END DH PARAMETERS-----</literal></screen>
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[d3469f0] | 116 | </note>
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[2a7d6c3e] | 117 |
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[4da2d9f] | 118 | <para>
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| 119 | Fix the bundled systemd unit so it does not use a deprecated dependency:
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| 120 | </para>
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| 121 |
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[b8c3180] | 122 | <screen><userinput>sed -i /syslog.target/d tools/stunnel.service.in</userinput></screen>
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[4da2d9f] | 123 |
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[7ff0948] | 124 | <!--
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[ac38e9dc] | 125 | <para>
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| 126 | On some systems, <command>configure</command> may fail if using
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| 127 | <application>Binutils</application> 2.25. Fix the issue by
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| 128 | running the following command:
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| 129 | </para>
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| 130 |
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[7ff0948] | 131 | <screen><userinput>sed -i '/LDFLAGS.*static_flag/ s/^/#/' configure</userinput></screen> -->
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[ac38e9dc] | 132 |
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[436c2f7e] | 133 | <para>Install <application>stunnel</application> by running the following
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[d3469f0] | 134 | commands:</para>
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[295ca00] | 135 |
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| 136 | <note>
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| 137 | <para>For some systems with <application>Binutils</application>
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| 138 | versions prior to 2.25, <command>configure</command> may fail. If
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| 139 | necessary, fix it with: </para>
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| 140 |
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| 141 | <screen><userinput>sed -i '/LDFLAGS.*static_flag/ s/^ /#/' configure</userinput></screen>
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| 142 |
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| 143 | <para>or, if <xref linkend="llvm"/> with Clang is installed, you can
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| 144 | replace <command>./configure ...</command> with <command>CC=clang
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| 145 | ./configure ...</command> in the first command below.</para>
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| 146 | </note>
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[d3469f0] | 147 |
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[ac38e9dc] | 148 | <screen><userinput>./configure --prefix=/usr \
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| 149 | --sysconfdir=/etc \
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[372898b] | 150 | --localstatedir=/var &&
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[d3469f0] | 151 | make</userinput></screen>
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| 152 |
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[50d61ed] | 153 | <para>This package does not come with a test suite.</para>
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| 154 |
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[d3469f0] | 155 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[305e60de] | 156 |
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[1ae11c9] | 157 | <screen role="root"><userinput>make docdir=/usr/share/doc/stunnel-&stunnel-version; install</userinput></screen>
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[305e60de] | 158 |
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[4da2d9f] | 159 | <para>
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| 160 | Install the systemd unit by running the following command as the
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| 161 | <systemitem class="username">root</systemitem> user:
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| 162 | </para>
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| 163 |
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| 164 | <screen role="root"><userinput>install -v -m644 tools/stunnel.service /lib/systemd/system/stunnel.service</userinput></screen>
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| 165 |
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[ac38e9dc] | 166 | <para>If you do not already have a signed SSL Certificate and Private Key,
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| 167 | create the <filename>stunnel.pem</filename> file in the
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| 168 | <filename class="directory">/etc/stunnel</filename> directory using the
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| 169 | command below. You will be prompted to enter the necessary
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| 170 | information. Ensure you reply to the</para>
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| 171 |
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[372898b] | 172 | <screen><prompt>Common Name (FQDN of your server) [localhost]:</prompt></screen>
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| 173 |
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| 174 | <para>prompt with the name or IP address you will be using
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| 175 | to access the service(s).</para>
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| 176 |
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[ac38e9dc] | 177 | <para>To generate a certificate, as the
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| 178 | <systemitem class="username">root</systemitem> user, issue:</para>
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[372898b] | 179 |
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| 180 | <screen role="root"><userinput>make cert</userinput></screen>
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| 181 |
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[d3469f0] | 182 | </sect2>
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[2a7d6c3e] | 183 |
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[d3469f0] | 184 | <sect2 role="commands">
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| 185 | <title>Command Explanations</title>
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[2a7d6c3e] | 186 |
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[1ae11c9] | 187 | <para><command>make docdir=... install</command>: This command installs the
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[ac38e9dc] | 188 | package and changes the documentation installation directory to standard
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[372898b] | 189 | naming conventions.</para>
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[2a7d6c3e] | 190 |
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[d3469f0] | 191 | </sect2>
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[2a7d6c3e] | 192 |
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[d3469f0] | 193 | <sect2 role="configuration">
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[436c2f7e] | 194 | <title>Configuring stunnel</title>
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[2a7d6c3e] | 195 |
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[d3469f0] | 196 | <sect3 id="stunnel-config">
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| 197 | <title>Config Files</title>
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[2a7d6c3e] | 198 |
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[d3469f0] | 199 | <para><filename>/etc/stunnel/stunnel.conf</filename></para>
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[2a7d6c3e] | 200 |
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[d3469f0] | 201 | <indexterm zone="stunnel stunnel-config">
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| 202 | <primary sortas="e-etc-stunnel-stunnel.conf">/etc/stunnel/stunnel.conf</primary>
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| 203 | </indexterm>
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[2a7d6c3e] | 204 |
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[d3469f0] | 205 | </sect3>
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[2a7d6c3e] | 206 |
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[d3469f0] | 207 | <sect3>
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| 208 | <title>Configuration Information</title>
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| 209 |
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[1ae11c9] | 210 | <para>As the <systemitem class="username">root</systemitem> user,
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| 211 | create the directory used for the
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[ac38e9dc] | 212 | <filename class="extension">.pid</filename> file created
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[436c2f7e] | 213 | when the <application>stunnel</application> daemon starts:</para>
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[1ae11c9] | 214 |
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[8ba08b56] | 215 | <screen role="root"><userinput>install -v -m750 -o stunnel -g stunnel -d /var/lib/stunnel/run &&
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| 216 | chown stunnel:stunnel /var/lib/stunnel</userinput></screen>
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[1ae11c9] | 217 |
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| 218 | <para>Next, create a basic <filename>/etc/stunnel/stunnel.conf</filename>
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| 219 | configuration file using the following commands as the
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| 220 | <systemitem class="username">root</systemitem> user:</para>
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[d3469f0] | 221 |
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[708f97e9] | 222 | <screen role="root"><userinput>cat >/etc/stunnel/stunnel.conf << "EOF" &&
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[1ae11c9] | 223 | <literal>; File: /etc/stunnel/stunnel.conf
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[2a7d6c3e] | 224 |
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[372898b] | 225 | ; Note: The pid and output locations are relative to the chroot location.
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| 226 |
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[1ae11c9] | 227 | pid = /run/stunnel.pid
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[2a7d6c3e] | 228 | chroot = /var/lib/stunnel
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| 229 | client = no
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| 230 | setuid = stunnel
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[30ca77d2] | 231 | setgid = stunnel
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[372898b] | 232 | cert = /etc/stunnel/stunnel.pem
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| 233 |
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| 234 | ;debug = 7
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| 235 | ;output = stunnel.log
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| 236 |
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| 237 | ;[https]
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| 238 | ;accept = 443
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| 239 | ;connect = 80
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| 240 | ;; "TIMEOUTclose = 0" is a workaround for a design flaw in Microsoft SSL
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| 241 | ;; Microsoft implementations do not use SSL close-notify alert and thus
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| 242 | ;; they are vulnerable to truncation attacks
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| 243 | ;TIMEOUTclose = 0</literal>
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[2a7d6c3e] | 244 |
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[295ca00] | 245 | EOF</userinput></screen>
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[2a7d6c3e] | 246 |
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[ac38e9dc] | 247 | <para>Finally, add the service(s) you wish to encrypt to the
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[1ae11c9] | 248 | configuration file. The format is as follows:</para>
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[2a7d6c3e] | 249 |
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[3597eb6] | 250 | <screen><literal>[<replaceable><service></replaceable>]
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| 251 | accept = <replaceable><hostname:portnumber></replaceable>
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| 252 | connect = <replaceable><hostname:portnumber></replaceable></literal></screen>
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[d3469f0] | 253 |
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[436c2f7e] | 254 | <para>If you use <application>stunnel</application> to encrypt a daemon
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[d3469f0] | 255 | started from <command>[x]inetd</command>, you may need to disable that
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| 256 | daemon in the <filename>/etc/[x]inetd.conf</filename> file and enable a
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[3597eb6] | 257 | corresponding <replaceable><service></replaceable>_stunnel service. You
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[d3469f0] | 258 | may have to add an appropriate entry in <filename>/etc/services</filename>
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| 259 | as well.</para>
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| 260 |
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| 261 | <para>For a full explanation of the commands and syntax used in the
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[ac38e9dc] | 262 | configuration file, issue <command>man stunnel</command>.</para>
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[d3469f0] | 263 |
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| 264 | </sect3>
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| 265 |
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| 266 | <sect3 id="stunnel-init">
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[96733af] | 267 | <title>Systemd Units</title>
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| 268 |
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| 269 | <para>
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| 270 | To start the <command>stunnel</command> daemon at boot,
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| 271 | enable the previously installed systemd unit by
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| 272 | running the following command as the
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| 273 | <systemitem class="username">root</systemitem> user:
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| 274 | </para>
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[d3469f0] | 275 |
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| 276 | <indexterm zone="stunnel stunnel-init">
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| 277 | <primary sortas="f-stunnel">stunnel</primary>
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| 278 | </indexterm>
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| 279 |
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[4da2d9f] | 280 | <screen role="root"><userinput>systemctl enable stunnel</userinput></screen>
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[d3469f0] | 281 |
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| 282 | </sect3>
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| 283 |
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| 284 | </sect2>
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| 285 |
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| 286 | <sect2 role="content">
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| 287 | <title>Contents</title>
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| 288 |
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| 289 | <segmentedlist>
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| 290 | <segtitle>Installed Programs</segtitle>
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| 291 | <segtitle>Installed Library</segtitle>
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| 292 | <segtitle>Installed Directories</segtitle>
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| 293 |
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| 294 | <seglistitem>
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[295ca00] | 295 | <seg>
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| 296 | stunnel
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| 297 | and stunnel3
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| 298 | </seg>
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| 299 | <seg>
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| 300 | libstunnel.so
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| 301 | </seg>
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[ac38e9dc] | 302 | <seg>/etc/stunnel,
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[295ca00] | 303 | /usr/lib/stunnel,
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| 304 | /usr/share/doc/stunnel-&stunnel-version;, and
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| 305 | /var/lib/stunnel</seg>
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[d3469f0] | 306 | </seglistitem>
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| 307 | </segmentedlist>
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| 308 |
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| 309 | <variablelist>
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| 310 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 311 | <?dbfo list-presentation="list"?>
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[869b15ae] | 312 | <?dbhtml list-presentation="table"?>
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[d3469f0] | 313 |
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| 314 | <varlistentry id="stunnel-prog">
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| 315 | <term><command>stunnel</command></term>
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| 316 | <listitem>
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| 317 | <para> is a program designed to work as an SSL
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| 318 | encryption wrapper between remote clients and local
|
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[3597eb6] | 319 | (<command>{x}inetd</command>-startable) or remote servers.</para>
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[d3469f0] | 320 | <indexterm zone="stunnel stunnel-prog">
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| 321 | <primary sortas="b-stunnel">stunnel</primary>
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| 322 | </indexterm>
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| 323 | </listitem>
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| 324 | </varlistentry>
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| 325 |
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| 326 | <varlistentry id="stunnel3">
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| 327 | <term><command>stunnel3</command></term>
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| 328 | <listitem>
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| 329 | <para>is a <application>Perl</application> wrapper script to use
|
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| 330 | <command>stunnel</command> 3.x syntax with <command>stunnel</command>
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| 331 | >=4.05.</para>
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| 332 | <indexterm zone="stunnel stunnel3">
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| 333 | <primary sortas="b-stunnel3">stunnel3</primary>
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| 334 | </indexterm>
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| 335 | </listitem>
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| 336 | </varlistentry>
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| 337 |
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| 338 | <varlistentry id="libstunnel">
|
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| 339 | <term><filename class='libraryfile'>libstunnel.so</filename></term>
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| 340 | <listitem>
|
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| 341 | <para> contains the API functions required by
|
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[436c2f7e] | 342 | <application>stunnel</application>.</para>
|
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[d3469f0] | 343 | <indexterm zone="stunnel libstunnel">
|
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| 344 | <primary sortas="c-libstunnel">libstunnel.so</primary>
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| 345 | </indexterm>
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| 346 | </listitem>
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| 347 | </varlistentry>
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| 348 |
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| 349 | </variablelist>
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| 350 |
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| 351 | </sect2>
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[2a7d6c3e] | 352 |
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| 353 | </sect1>
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